Fifty years after the creation of the Polytope of Cluny by Iannis Xenakis, Ircam reproduces this sound and immersive experience which welcomed 100 000 participants in two years.
Hundreds electronic flashes and 3 laser beams (red, blue, green). Fixed and pivoting mirrors are added to separate, multiply, and reflect the rays or create illusions by their direction and number. The Polytope music of Cluny is recorded on 7 tracks. An eighth track is used for the programming, which contains the visual events as well as the music of a duration of 24 minutes in Fortran 4 language. For the first version of the show (1972-73), the public is totally immersed by the tracings of light, while lying down or sitting on the ground.